11-29-2019 | #31 |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Another What Oil do u use thread
Did a little research today. My 1990 owners manual specifies 10w30 type “SG” spec oil for the ZR-1/LT5. On the website Bobistheoilguy.com site I found the original ZDDP spec for type “SG” spec oil was at level of 1000 - 1400 ppm back in the 1990’s.
https://www.bobistheoilguy.com/forum...71&type=thread I assume therefore that the original minimum engineering spec for ZDDP is probably ~1000ppm. It is also probably safe to assume that any oil with a ZDDP spec of 1000ppm to 1400ppm that otherwise meets “SG” spec. is correct. That said, I still believe the concern for ZDDP levels in our cars is wildly overblown. The original failures reported were exclusively in high performance push rod flat tappet engines with high lift cams and extraordinarily high valve spring pressures. While our engine may have “flat Tappets” or buckets our valve spring pressures are less than half of those where these issues showed themselves. When they talked about “flat tappet” engines Overhead Cam engines were not in the mix. Should we err on the side of caution, by all means. It is certainly wise to make sure the oil we use has at least 1000ppm of ZDDP. Conversely, those that don’t are certainly not in imminent danger of cam failure. My guess is that most of the ZR-1 currently running around today are on a modern oil like Mobil One with the lower ZDDP rating. We certainly don’t see cam failures left and right. As a matter of fact cam failures remain exceedingly rare. That’s my 2 cents, your mileage may vary. H
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
11-29-2019 | #32 |
Join Date: May 2013
Location: Chicago
Posts: 980
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Re: Another What Oil do u use thread
I am not a fan of using a 40 weight oil in a motor designed to use a 30 weight oil.
The amsoil Z rod on eBay it is only ~$9 more for 5 quarts with free shipping and handling than the high end Mobile 1 in Walmart.
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* Last edited by Karl; 11-29-2019 at 10:30 PM. |
11-29-2019 | #33 |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,797
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Temperature and Wear Paramaters that Effect Oil Wt.
As an engine wears with mileage you can in general use heavier oils.
The wt of oil to use also depends on the average operational environmental temperatures. I use a 180 deg unmodified New Thermostat in all engines. The wt of oil also depends on your engine cooling system if you operate the engine on the 'Hot" side or "cool" side. I use Amsoil 10w-40 in the LT5 engines. I use Mobile 1 10w-30 in the L98 engines. I use After Market Aluminum Radiators and in general operate in "warm" Climates but have operated at Air temperatures of 30-50 degs F.
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Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 12-03-2019 at 08:52 AM. |
12-03-2019 | #34 |
Join Date: Jan 2004
Location: Alex VA
Posts: 1,087
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Re: Another What Oil do u use thread
no doubt that the amsoil stuff is very good
LPE recommended 15/50 in summer and 10/40 on the LSV 390 I stuck with that using wally world jugs and changed oil probably too often, but when we pulled the engine apart at 106k the liners, pistons, cams, and all looked good the one "concern" was that the idler shaft for the cam chain drives had some wear which was a bit odd
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95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP) |
12-03-2019 | #35 | |
Join Date: Sep 2008
Location: Mullica Hill, New Jersey
Posts: 2,582
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Re: Another What Oil do u use thread
Quote:
The only $0.01 that I can add are the oil companies have certainly added other, newer anti wear compounds that may not even have been around back when ZDDP was king, to today's modern formulations. As far as weight, Doug Rippie required 10-40 back in 1993 for my modified motor. Marty |
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12-03-2019 | #36 | |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,797
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Re: Another What Oil do u use thread
Quote:
That oil port is very small in the Idler Shaft for the amount of needle bearings it is lubricating (make sure it is clear when assembling). Those are needle bearings in the Idler Sprocket For Details..........Post 79 - Timing Chain Idler Sprocket Lubrication and Installation
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Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 12-03-2019 at 09:09 AM. |
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12-03-2019 | #37 |
Join Date: May 2013
Location: Chicago
Posts: 980
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Re: Another What Oil do u use thread
This is Mobile 1 Extended Performance 5W30 full synthetic with the gold label. I can scan a better image another time. Hope this is view able enough.
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* Last edited by Karl; 12-03-2019 at 09:21 AM. |
12-04-2019 | #38 | |
Join Date: Jan 2004
Location: Alex VA
Posts: 1,087
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Re: Another What Oil do u use thread
Quote:
I'm tempted to open that hole up just a little as my shaft looked like it was oil starved or the bearings weren't rolling / true It dug a very small wear mark that would be easy to miss if we weren't looking for it. Oddly enough the liner that wore was likely oil starved to but it wore at the bottom like the piston skirt was diggin in a bit (390 stroker) 3.875 sonny bryant crank that almost makes you think the nosebleed price is worth it!! thank goodness most of my "hard parts" were ok. Thanks for the pics!!
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95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP) |
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12-05-2019 | #39 | |||
Join Date: Jun 2013
Location: PA
Posts: 879
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Re: Another What Oil do u use thread
Quote:
From a Super Chevy article: "There are two ways a person can ensure they are using oil that has sufficient amounts of antiwear additives, commonly listed as 1,200 ppm ZDDP for flat-tappet engines with stock valve springs and 1,400 ppm for engines with higher spring rates." Part of the reason LT5's have very few cam failures is because as a fleet of 6000 some vehicles, they have relatively low mileage. The average mileage is nowhere near long term cam failure points. Quote:
From the other oil thread: Quote:
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